<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 两个数组的交集 -->
</body>
</html>
<script>
    function getIntersection(arr1, arr2) {
        let newarr = [];
        arr1.forEach(item => {
            if (arr2.indexOf(item) != -1&&newarr.indexOf(item)==-1) {
                    newarr.push(item)
                }
        })
        return newarr;
    }
    console.log(getIntersection([1,1,2,1,5], [1, 4, 5, 2, 2])); //[1, 2, 5]
</script>